The U.S. has confirmed that North Korea’s ability to produce additional weapons-grade plutonium has been halted as part of its denucelarization promise under a series of six-party agreements.

The U.S. State Department made the confirmation last week in commenting on the North’s transfer of nuclear-related documentation.

Eight of the eleven agreed disablement activities at three core nuclear facilities in Yongbyon were completed. A third of spent fuel rods were also removed from the facility.

Washington said the documentation provides data on the operation of a five-megawatt reactor and fuel reprocessing plant at the Yongbyon complex.

The State Department said it remains committed to the full implementation of the 2005 six-party agreement, which reaffirmed that the dialogue aims to keep the Korean Peninsula nuclear free in a peaceful way.